In this division, unless the context clearly indicates otherwise:
(1) BEST MANAGEMENT PRACTICES means schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce the pollution of waters of the United States. Best management practices also include treatment requirements, operating procedures, and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage.
(2) CHALK ZONE means the lower chalk member of the Austin chalk formation overlying the Eagle Ford shale formation. The chalk zone consists primarily of a chalk limestone with minor seams of shale and bentonite clays.
(3) CREST means that line above the escarpment line where the slope becomes less than 4:1.
(4) ESCARPMENT AREA REVIEW COMMITTEE means the committee described in Section 51A-5.209 of this chapter.
(5) ESCARPMENT FACE means that portion of the escarpment zone between the crest and the toe.
(6) ESCARPMENT LINE means that line formed by the intersection of the plane of the stratigraphic contact between the Austin chalk and the Eagle Ford shale formations and the surface of the land.
(7) ESCARPMENT ZONE means that corridor of real property south of Interstate Highway 30 between the following described vertical planes:
(A) On the crest side of the escarpment line and measuring horizontally from that line, the vertical plane that is 125 feet from that line, or 35 feet beyond the crest, whichever is farther from that line.
(B) On the toe side of the escarpment line and measuring horizontally from that line, the vertical plane that is 85 feet from that line, or 10 feet beyond the toe, whichever is farther from that line.
(8) FACTOR OF SAFETY means a combination of factors which, when considered together, indicates whether the slope is stable at a slip surface location. The factor of safety (Fs) is determined using the equation:
Fs = Shearing strength available along sliding surface
Shearing stresses tending to produce failure along surface
Shearing stresses tending to produce failure along surface
(9) GEOLOGICALLY SIMILAR AREAS means:
(A) areas adjacent to and similar to the escarpment zone by virtue of their slopes, soils, and geology; and
(B) the drainage basins containing the escarpment zone, excluding those portions of the basins which are:
(i) downstream from the areas described in Subparagraph (A) above; or
(ii) north of Interstate Highway 30.
(10) GRADING means excavation or filling or any combination thereof.
(11) REGISTERED PROFESSIONAL ENGINEER means a person who is duly licensed and registered to engage in the practice of engineering in the State of Texas in accordance with state law.
(12) SHALE ZONE means the Arcadia Park/Kamp Ranch members of the Eagle Ford shale formation which lie below the Austin chalk formation. The shale zone consists primarily of clays and shale with minor layers of limestone or sand.
(13) SLOPE means the slope of the terrain. For example, a 5:1 slope means a slope with an angle described by five feet horizontal to one foot vertical.
(14) STORM WATER POLLUTION PREVENTION PLAN means a plan required by either a construction general permit or an industrial general permit, which plan describes and ensures the implementation of practices to reduce pollutants in storm water discharges associated with construction or industrial activity at a site or facility.
(15) TOE means that line below the escarpment line where the slope becomes flatter than 5:1. (Ord. Nos. 19455; 25047; 26000)